The Effect of Extender Particle Size on the Glass Transition Temperature of Model Epoxy Coatings

Abstract

Inorganic extenders are important constituents of 2K thermosetting epoxy-amine coatings and their physical properties play an important role in the final properties of the organic coatings. The effects of extender particle size and loading (i.e., the amount of extender in component A or in the total formulation) on the glass transition temperature (Tg) of model epoxy-amine coatings were studied in this work with differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA). The obtained results show that the particle size and loading of feldspar particles (from 25 wt% to 70 wt%) do not influence the glass transition temperature of the model epoxy-amine coating significantly. In general, the smaller the particle size the lower the glass transition temperature of the coating but this depression in Tg seems negligible when seen relative to the change in extender particle size. Similar observations are reported for two model coatings having the same lamda (Λ) value but with silica of very different particle sizes (i.e., nanosilica and micron sized silica).

Use of Dynamic Mechanical Analysis (DMA) for Characterizing Interfacial Interactions in Filled Polymers

“…An experimental investigation of Preghenella et al [59] showed that water absorbed by the neat epoxy can also cause significant T g depression. Moreover, the dependence of T g and peak value of tan δ on the fumed silica content in epoxy composites reported by these authors was similar to that reported by Sun et al [58] and Bashir et al [52]. Dermani et al [60] studied the effect of ionic liquid (IL) modified graphene oxide (GO) addition on the mechanical properties of model epoxy-amine coatings.…”

“…Using model epoxy-amine coatings, Bashir et al [52] analyzed the effect of micrometersized commercial feldspar on the T g of coatings. DSC was mainly used in this study, but DMA also provided important insights into the interfacial interaction of epoxy resin with feldspar.…”

“…Generally, if the interfacial interactions between the matrix and filler particles are strong enough, the peak value of tan δ is reduced and the Tg shifts toward higher temperatures [11]. With increasing concentration of micro-or nanoparticles in a filled polymer, the value of the tan δ peak, typically, reduces due to increased interfacial interactions [51][52][53]. Therefore, DMA results (alone or in combination with other analytical techniques) can provide important information about the degree of filler dispersion (filler-filler interaction, filler-polymer interaction) and the extent of interfacial interactions in the interphase region.…”

Mechanical behavior of carbon/glass polypropylene hybrid composites

“…10 With increasing concentration of micro or nanoparticles in a filled polymer, the value of the peaks, typically, reduces due to increased interfacial interactions. 15,[38][39][40] The peak area and peak width, indicative of overall energy dissipation during the transition, vary across the samples. Notably, sample H3F, which combines both MAPP and GNP with 10% glass fiber, exhibits the highest energy dissipation, as evidenced by its peak area of 51616.5 MPa C. For the samples with the sample H4F, despite having a higher GNP content of 1%, do not show a proportional increase in energy dissipation, suggesting that merely augmenting the GNP content might not linearly enhance this property.…”

Recently Emerging Nanotechnological Advancements in Polymer Nanocomposite Coatings for Anti-corrosion, Anti-fouling and Self-healing

“…Varying chemical procedures are utilized in combining polymeric matrices with nanoparticles. These procedures include melt and solution intercalation, in situ and emulsion polymerization [36] , [37] , [38] , [39] . Relative to dispersion and distribution of nanoparticles’ in PNCs, both solution intercalation and situ polymerisation are perceived excellent for PNCs fabrication.…”